Update contribution guideline

[sazzad16]

No description provided.

[codecov-commenter]

Codecov Report

Merging #2958 (68f6715) into master (027f79a) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #2958      +/-   ##
============================================
- Coverage     53.72%   53.71%   -0.02%     
+ Complexity     3337     3336       -1     
============================================
  Files           217      217              
  Lines         13288    13288              
  Branches        774      774              
============================================
- Hits           7139     7137       -2     
- Misses         5902     5903       +1     
- Partials        247      248       +1     

Impacted Files	Coverage Δ
src/main/java/redis/clients/jedis/Protocol.java	88.12% <0.00%> (-1.25%)	⬇️

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[chayim]

Added some suggestions @sazzad16